US4528256A
Expired / Lapsed
US
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Electrophotographic recording material with condensation product
Assignee: Hoechst AG
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Filing: 1984-04-13
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Granted: 1985-07-09
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Expires: 2004-04-13
Abstract
Abstract The invention describes an electrophotographic recording material composed of an electrically conductive support layer, which is suitable in particular for the production of printing forms or printed circuits, and of a photoconductive layer comprised of an organic photoconductor, a binder and a sensitizer. The photoconductive layer additionally contains a condensation product of benzophenone-2-carboxylic acid and a dialkyl aniline, for example, benzophenone-2-carboxylic acid and diethyl aniline or 4'-methylbenzophenone-2-carboxylic acid and diethyl aniline.
Inventors
- 👤 Erwin Lind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:00
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0503; G03G5/051; G03G5/0517; G03G13/00; G03G13/26; G03G13/28; H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/061; H05K3/065
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
39 words
An electrophotographic recording material, comprising: (a) support layer; and (b) a photoconductive layer applied thereto, wherein the photoconductive layer comprises: an organic photoconductor; a binder; a sensitizer; and a condensation product of a benzophenone-2-carboxylic acid and a dialkyl aniline.
Claim 2
Dependent Claim
39 words
An electrophotographic recording material, comprising: (a) support layer; and (b) a photoconductive layer applied thereto, wherein the photoconductive layer comprises: an organic photoconductor; a binder; a sensitizer; and a condensation product of a benzophenone-2-carboxylic acid and a dialkyl aniline.
Claim 3
Dependent Claim
21 words
A recording material as in claim 1, wherein the photoconductive layer comprises a condensation product of benzophenone-2-carboxylic acid and diethyl aniline.
Claim 4
Dependent Claim
21 words
A recording material as in claim 1, wherein the photoconductive layer comprises a condensation product of 4'-methylbenzophenone-2-carboxylic acid and diethyl aniline.
Claim 5
Dependent Claim
12 words
A recording material as in claim 1, wherein the photoconductor comprises 2,5-bis(4'-dialkylaminophenyl)-1,3,4-oxadiazole.
Claim 6
Dependent Claim
30 words
A recording material as in claim 1, wherein the mixing ratio of organic photoconductor to condensation product is within a range of from about 1:1 to 1:5 parts by weight.
Claim 7
Dependent Claim
24 words
A recording material as in claim 1, wherein the sensitizer comprises a mixture of Astrazone Orange (R) (C.I. 48 040) and a Rhodamine dyestuff.
Claim 8
Dependent Claim
26 words
A recording material as in claim 1, wherein the sensitizer comprises a mixture of Astrazone Orange (R) (C.I. 48 040) and Brillant Green (C.I. 42 040).
Claim 9
Dependent Claim
21 words
A recording material as in claim 1, wherein the photoconductive layer has a thickness of from about 2 to 10 μm.
Claim 10
Dependent Claim
15 words
A recording material as in claim 1, wherein the photoconductive layer comprises an alkali-soluble binder.
Claim 11
Dependent Claim
22 words
A recording material as in claim 9, wherein the binder is a copolymer of styrene and maleic acid anhydride or phenol resin.
Claim 12
Dependent Claim
22 words
A recording material as in claim 1, wherein the dialkyl aniline comprises an alkyl group having from 1 to 4 carbon atoms.
Claim 13
Dependent Claim
17 words
A recording material as in claim 1, wherein the dialkyl aniline is dimethyl aniline or diethyl aniline.
Claim 14
Dependent Claim
15 words
A recording material as in claim 1, wherein the organic photoconductor comprises an oxadiazole derivative.
Claim 15
Dependent Claim
31 words
A recording material as in claim 1, wherein the sensitizer is present in a ratio of from about 0.001 to 0.1 parts by weight sensitizer per 1 part by weight photoconductor.
Claim 16
Dependent Claim
18 words
A recording material as in claim 1, wherein the binder is soluble in aqueous and alcoholic solvent systems.
Claim 17
Dependent Claim
18 words
A recording material as in claim 15, wherein the binder comprises a high-molecular substance with an alkali-solubilizing group.
Claim 18
Dependent Claim
22 words
A recording material as in claim 1, wherein the condensation product comprises an alkyl-substituted derivative of benzophenone-2-carboxylic acid and a dialkyl aniline.
Claim 19
Dependent Claim
23 words
A recording material as in claim 1, wherein the support comprises aluminum foil, and wherein the foil has been mechanically or electrochemically roughened.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |